662-44352 Water Pump Impeller for Yamaha Mariner 8A 8B 15A | JLM Marine

662-44352 Water Pump Impeller for Yamaha Mariner 8A 8B 15A

This outboard water pump impeller is engineered to fit Yamaha Mariner 8HP and 15HP outboard motors, including models 8A(M), 8A(ML), 8B(M), 8B(ML), 15A(M), and 15A(ML) within specified serial number ranges. Designed as a direct replacement for OEM part number 662-44352, this impeller ensures reliable cooling system performance for your outboard engine.

This impeller serves as a direct replacement for multiple OEM and aftermarket part numbers including Yamaha Marine 662-44352-01, 662-44352-00, Sierra Marine 18-3063, CEF Marine 500321, Mallory Marine 9-45608, and GLM Marine 91005, providing broad cross-compatibility across major marine parts brands.

• Complete package includes impeller with key/pin for easy installation
• 6-blade rubber impeller design for efficient water flow
• Compact dimensions: 40.0mm diameter, 22.0mm height

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

Your package includes:

• Water Pump Impeller with Key/Pin

Installation Guide

1. Disconnect the fuel line and remove the spark plug wire to ensure the engine cannot start during installation.
2. Remove the lower unit from the outboard motor following your engine's service manual.
3. Disassemble the water pump housing by removing the retaining bolts and carefully separating the components.
4. Remove the old impeller from the pump housing, noting its orientation and the position of the key/pin.
5. Clean the pump housing thoroughly, removing any debris, old gasket material, or corrosion.
6. Lubricate the new impeller blades with glycerin, soapy water, or water pump grease to ease installation.
7. Insert the key/pin into the drive shaft slot, ensuring it is properly seated.
8. Install the new impeller onto the drive shaft, rotating it in the correct direction while gently pressing it into the housing.
9. Ensure all impeller blades are properly oriented and none are bent backward or damaged.
10. Reassemble the water pump housing with new gaskets, tightening bolts to manufacturer specifications.
11. Reinstall the lower unit onto the outboard motor, ensuring proper alignment and secure mounting.
12. Reconnect the spark plug wire and fuel line, then test the cooling system by running the engine in water to confirm proper water flow.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Yamaha Mariner outboard?
A: Check the compatible engine models table above and verify your engine's model number and serial number range. You can find your serial number on the mounting bracket or transom clamp. Cross-reference with the part number list to ensure compatibility.

Q: How often should I replace my water pump impeller?
A: Most manufacturers recommend replacing the impeller every 2-3 years or 300-400 hours of operation, whichever comes first. If you operate in sandy or debris-filled water, inspect and replace more frequently.

Q: What are the signs that my impeller is failing?
A: Common symptoms include weak water flow from the telltale (indicator stream), engine overheating, steam from the engine, or pieces of rubber in the cooling system. If you notice any of these signs, inspect and replace the impeller immediately.

Q: Can I install this impeller myself or do I need a mechanic?
A: If you have basic mechanical skills and follow the service manual, you can install it yourself. However, professional installation is recommended to ensure proper torque specifications and avoid damage to the water pump housing or drive shaft.

Q: Why is the key/pin included important?
A: The key/pin locks the impeller to the drive shaft, ensuring it rotates properly to pump water. Without it or if improperly installed, the impeller will not function and your engine will overheat.

Q: Is this an OEM part or aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.